Locomotive brake device.



W. V. TURNER.

LOCOM'OIIVE BRAKE DEVICE.

APPLICATION FlLED OCT. 25, 1917.

l Q I 7 QU I5. 9 Patented Aug. 27, 1918.

INVENTOR i rid WALTER v. TURNER, or wrrirrnssune, rnnivsrnvrrn'rn, assrsnoa 'ro rnn WESTING- HOUSE am BRAKE corrranr, or PENNSYLVANIA.

ament,

Be it known that'L'lVAL'rEn V. Tnnn rin',

a citizen of the United States, resijdingat lVilkinsburg, in the county" ofellegheny and State of Pennsylvania, haveinvented' new and useful Improvements in Locomotive Brake Devices, of which the following is a spec1fi'cat1on.'

This invention relates-to fluid pressure brakes, and more particularly to a locomotive brake equipments L It' has heretofore been proposed to provide a locomotive brake equipment in which-the supply offiuid to the locomotive brakecylinders is controlled by a'piston subject to the' opposing pressures of the brake cylinder and an application chamber. a I

Where a brake applicationis ef ected with an equipment of the above character, the brake cylinder pressure risespromptly with the rise in pressure in the application chamber. On the cars of the train, the supply of fluid to the brake cylinder is controlled by a triple valve device and the rise in orake cylinder pressure is dependent upon the rate;

of reduction in brake pipe pressure, so that the brake cylinder pressure on the cars rises more slowly than on the locomotive, thus causing a running in of the slack which is undesirable.

The principal object of my invention is to provide improved means for delaying or retarding the application of the brakes on the locomotive.

In the accompanying drawing, the single figure is a sectional view of a locomotive distributing valve device embodying my invention.

As shown in the drawing, the distributing valve device may comprise a casing 1 containing an equalizing valve device and an application and release valve device.

The equalizing valve device may comprise a piston 2 contained in piston chamber 3, connected to brake pipe 4, and adapted to operate a main slide valve 5 and an auxiliary valve 6, contained in valve chamber 7, which is connected by passage 8 with a pressure chamber 9.

The application and release valve device ,ymay comprise a piston 10, contained in piston chamber 11, .an application valve 12,

contained in valve chamber 13, connected by pipe 1% to reservoir 15, and a release valve Application filed October as, 1917' O3? NILBIERDING, PENNSYL'V'ANIA, A CORPORATION es ence-I' e is'zaa ir'rrnvren l Serial no. reason; f 1

16 contained in valve chamber 17, which is connected by passage 18 and pipe 19 with" brakecylinderfiO. Accord1 ng to my invention," aspring stop piston 21 is mounted in valve chamber 17, in

alineii'ientiwith the piston sterner" piston l'O and ISPYOYlCiQCl-Wltliti socket for reeivinga'; reduced proj ecting' portion 23 or i the to the pressureof a springQ' r and the spring {side of the piston is open to tli'c atmosphere "tln-ough ap'ort I In operation, \"vhe'n an app 1 brakes is effected, the equalizing piston2 is operated upon redii'Ctionin brake pipe pressure shiftihe' mian slide valve 5 and the auxiliary slide valve 6, so that fluid under pressure is snpplied'fro-invalve i; and the pressure chamber 9 'i chamber Z Y 7 through port 26 to passage 2'7 and thence through passage 28 to piston chamber 11, a

cavity 29 being provided for connecting the pamage 27 with a passage 30 leading to application chamber 31.

The piston 10, however, is not moved from release position until the pressure in the piston chamber 11 has been increased to a predetermined degree, slightly exceeding the resisting pressure of the spring as l t hen this predetermined pressure has developed, the piston 10 is moved and the stop piston 21 is shifted to its outer seat, compressing the spring 2 As the brake cylinder pressure increases, the eilective pressure of the spring 24: on the piston stem 22 is reduced, until at apredetermined brake cylinder pressure, the spring pressure is entirely balanced, so that thereafter, the application piston is not influenced by the action of the spring,

It will thus be seen that while the application of the brakes is initially retarded on the locomotive, the brake cylinder pressure can be increased, if desired, to substantially equal the pressure in the application chamber, since the application piston. is not influenced by the spring 2% after the brake cylinder pressure has been increasedto a predetermined degree,

In releasing the brakes, when the brake cylinder pressure has decreased to a predetermined degree, the spring 24 will again act and with ncreasing force as the brake The as pawn -21 ijs 'subj ec t on as side I,

I ation ot the cylinder pressure is further reduced, so that the final release of the brakes is made more certain, since the spring 24 aids the brake cylinder pressure in shifting the application piston to full release position.

Having now described my invention, What I claim as new and desire to secure by Letters Patent, is:

1, In a fluid pressurebrake, the combination With a brake cylinder, of a .valve device having a piston subject to the opposing pressures of the brake cylinder and an application chamber for effecting an application of the brakes and a stop device subject onone side to brake cylinder pressure and on the opposite side constantly to atmospheric pressure and the pressure of a spring for opposing the movement of said piston.

\ 2. In a fluid pressure brake, the combination with a brake cylinder, of a valve device having a piston subject to the opposing pressures of the brake cylinder and an application chambena'valve operated by said piston upon an increase in pressure in the application chamber for supplying fluid to the brake cylinder, and a piston stop device acting on said piston and subject on one side to brake cylinder pressure and on the opposite side constantly to atmospheric pressure and the pressure of a spring for initially retarding the application of the brakes.

3. In a fluid pressure brake, the combination with a brake cylinder, of a valve device having a piston subject to the opposing pressures of the brake cylinder and an application chamber, a valve operated by said piston upon an increase in pressures in the application chamber for supplying fluid to the brake cylinder, and a piston stop device acting on said pistonand subject on one side to brake cylinderpressure and on the opposite side constantly to atmospheric pressure and the pressure of a spring for initially retarding the application of the brakes, the spring stop device being out out of action at a predetermined brake cylinder hand.

WALTER V. TURQER. 

